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Other Financial Information (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Financial Information [Abstract]      
Income taxes paid, net of refunds $ 113,520 $ 158,063 $ 47,757
Interest paid $ 31,798 $ 34,019 1,647
Noncash reductions to net parent investment related to settlement of income taxes     $ 453